Requirements

• Python 2.7+ or 3.2+

• PyYAML >= 3.1

Configuration Environments

Because configuration often differs depending on the environment, e.g. production and testing settings, yconf allows you to define multiple environments in a single configuration. The current supported environemts are production, staging and development. For convenience, yconf is able to merge environment configuration to reduce redundancy, meaning that if the environment is set to staging, the configuration will inherit all settings available in a production environment and override them with staging values where neseccary.

production:
  rundir: /var/run/example
  database: /var/lib/example/db.sqlite
  loglevel: warning

staging:
  database: :memory:

development:
  loglevel: debug

# production environment
config.rundir: /var/run/example
config.database: /var/lib/example/db.sqlite
config.loglevel: warning

# staging environment
config.rundir: /var/run/example
config.database: :memory:
config.loglevel: warning

# development environment
config.rundir: /var/run/example
config.database: :memory:
config.loglevel: debug

Command Line Arguments

Extending the argument list supported by a configuration will require subclassing yconf.BaseConfiguration and overriding the makeParser method.

Example

import sys
from yconf import BaseConfiguration

class MyConfig(BaseConfiguration):

  def makeParser(self):
    parser = super(MyConfig, self).makeParser()
    parser.add_argument("-f", "--foo", dest="foo")
    return parser


config = MyConfig()
config.parse(sys.argv[1:])

The following configuration arguments are already preset:

• -c Path to configuration file or directory

• -e The environment used for configuration (default: production)

When present, command line argument always take precedent over configuration settings. To override nested yaml values, a dotted destination path can be set for the argument.

config.yml

logging:
  loglevel: debug

Argument

parser.add_argument("--log-level", dest="logging.loglevel")

Accessing Configuration

Configuration can be accessed either by attribute or by key.

config = MyConfig()
config.parse(args)

config.foo == config['foo']
config.foo.bar == config['foo']['bar']